Windows 10 being tested on dual-core 512MB Nokia Lumia 520

Let’s not dwell too much on the fact that we’re supposed to call Microsoft's next OS Windows 10, but have to specify Windows 10 for Phone so might as well call it - you guessed it - WINDOWS PHONE 10. Ahem.

We’re hearing that Windows 10 (for Phone) is being tested on the humble Nokia Lumia 520, a pleasant surprise indeed.

Some cynics suspected this might mean Windows Phone devices with 512MB of RAM and a quad-core processor – the Nokia Lumia 530, for example – with a giant question mark still hanging over the likes of the dual-core Lumia 520.

But nope! Joe Belfiore says Microsoft is aiming low with Windows 10 minimum requirements, right down to the aforementioned Lumia 520.

The Windows Phone guy tweets: “Hey all: we ARE working on Win10 for 512MB, including 520. Our ambition is to make #Win10 available for these devices but features may vary”.

Sounds reasonable to us! Especially considering the modest Nokia Lumia 520 was first released waaaaay back in April 2013 - almost two years ago.

It's not clear which Windows 10 features might be axed, but expect Windows 10 Technical Preview news in abundance in the coming weeks and months.

It's been suggested that the first Windows 10 handsets might debut at Mobile World Congress (MWC) 2015 in three weeks' time, but we'll believe that when we see it.